Any positive integer is of the form:
1
6q or 6g + 2 or 6g + 4, where q is some non-negative integer.
2
3q or 3q + 1 or 3q + 2, where q is some non-negative integer.
3
6g + 1 or 6q + 3 or 6g + 5, where q is some non-negative integer.
4
6q or 6g +1 or 6q + 2, where q is some non-negative integer.